Show that the diagonals of a rhombus are perpendicular to each other.

Show that the diagonals of a square are equal and bisect each other at right angles.

Unpolarised light is incident on a plane glass surface. What would be the angle of incidence so that the reflected and refracted rays are perpendicular to each other.

Prove that the bisectors of two adjacent angles of a parallelogram are perpendicular to each other.

A ray of light is incident on liquid surface such that reflected and refracted ray are perpendicular to each other. If refractive index is 1.4, find angle of incident.

Show that if the diagonals of a quadrilateral bisects each other at right angles. Then it is a rhombus.

Unpolarised light is incident from air on a plane surface of a material of refractive index u! At a particular angle of incidence mu it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation ?

To draw two tangents to a circle which are perpendicular to each other, the perpendiculars are to be drawn at the ends of two radii which are inclined at an angle of……..